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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea14bec99fdee23eaa34550c5daa38a9b129313733812fe557c6a723726d7290' 
  AND token = 'zPUvsHqR/uNhqveH/933i53MS6EegZOMXKzwR/34jx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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