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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71369a4c8bc9d2739cb493807eeb98ecc0dc9a513fd5757f7c9aa70b99e00af4' 
  AND token = '3/x7CY9kQXpJ35X5B4/RBZkF8Ls/gVxoFVt2uI6PfTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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