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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e058d230a15e47ff5e564dd71e3993adbc2c8fabce4c3dd169d52332608de683' 
  AND token = '4FjxEduFEjuPg5C2ywj6/3zeYRCJrWfmtYII9DRIfBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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