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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7e9728bdbc11e2c3e88e5a49499a30ef085d6b5984708c8f874519e8ef9c3e' 
  AND token = 'Yxa1Ia/oE1zRa86TD2odypcLuByml1g4ldn1pqKU1tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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