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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3964e9e6e13710ae78094fc8a4d1ab091294fce5f329586abf8c6161343ff2f1' 
  AND token = '03Nio0z7/GjxZpvHfUzDEQUBWNB73EvKE2lv8V68/As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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