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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0520e0046fadbcd57fd7e8d3c316c1a055100b7ff72dfd13c6a3f0ce2cd2b484' 
  AND token = '74vXIpMEcmrerJdfi0jU0Ja/OOgbQZovC5LMuW1z328=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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