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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f666aa870e232f8845eedb60c49690d61bb6000af3c884c2669ff7479525cb3' 
  AND token = 'LPmZ14yHVFkozCOF4HcIQE4eQqXBI9gxQHRF201yHOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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