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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f294253415d6435b185cfd58f77aa56e5efb6a1850ba706dd66486c46f78c970' 
  AND token = 'h3btGHloItbGGI4jxN70i+2hBgYAuVfBb2d9DGhfS10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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