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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c5c397a20a85e4b605496f874d0cece6f12f6beb507f64416a4f6bc300db48' 
  AND token = 'kCb9No43l8W6q5FM5nWywF+fL/f/KDDlLktbiqWSqxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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