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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd607b933665400eeadd218f91549b5fc5f604f5b87e001ff7b672d19e611f8c2' 
  AND token = '6cyXiEAvOjVhGhfRvtLnyC+Ggho07W9r77bhdPHeA1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00148

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}