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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f46834f4a5637e7638d7b717cb289afc1c439145eeb7076662e94315b73b87' 
  AND token = 'zXQ64UmgrnKfK8dA+Aa86LRnE8reB//rXhLPHz+rRD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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