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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23aaf6946330ce045f9e209b493785e0601ee6d81ac91d9e70a2f12b10d84b9' 
  AND token = 'abLNRGJQceh1Fr/Z6meSyPuskhD0DM8E+fQ7xSpstKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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