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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972225d31d59b71cf4704941070ff304b726692efe7a8306460e83e8aea80d0f' 
  AND token = 'vaw/KoQwAkmNmzT9VlQQbpQtXpKHA6lQDycTVrEUAbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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