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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e1ab961f3f7bb3411b9c3f7a0992a99f5ccd083f9ca18235ef050fb6cb44f38' 
  AND token = '92CuJFioXgaV+Wk7SOSweZPmVxJijTD1ao2aC+HuGF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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