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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec0a95c67c08eb8e05a1ad8df55e2697789f0e82308fbcb88addce37a5bc2fa' 
  AND token = 'OV8v6ItzVhWVBI5BKDZMvp5RDgJaCWNhArcLmi5P6nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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