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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c1fe05ef6dc84e44774d12e5ac9d2b6fb6f6174c48f38f0549984c61e73c56' 
  AND token = '5xNkjJgg4BAZi+NR4shT/29qMkbPmE0OnlsLJurs7jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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