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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a028c7782c4d8afc675423f972eaf03c15a4d34e0b0703df0a7e44deff5b81fe' 
  AND token = 'A/VYavWu5yURApO+PJ9IPVoNYuo0+SxQ+QyVDWI6EKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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