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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ab775d3a5337eec95213681b5efa105a75728624c0c14af5327d3d4cc1ca59' 
  AND token = 'UdFHeLO1qrLPgNwngX8oqwHpbj/Anko6kQG21FA33IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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