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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a7a92d27111e8ced4767d569b490bb2175245e33161a5521edc07ddca7956b' 
  AND token = '2O1jT4kUUz6sUov9Pqqy1pqUuBC2DApxaEQJ0uHTxho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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