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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927d9503388351c14f1fed90eb50e3ba8e400b8655027d34eb5b87834546d0c0' 
  AND token = 'W9q/bnyhpvxLxFa+eGrn0ek2ldVepuB5EpqENsn+bzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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