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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34c07e8ac3876c09e425ee675d5e09579f03a94b21cc6cd1878bfa520ef4ea0' 
  AND token = '6CyW7uBkkCu8sZn2Sdgydh9iw6NS29i+g2QQWyIHpBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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