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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c465342d92ea0c0b7487ddfd67f89850a418214a42d93f8e24fc551577a1ba4d' 
  AND token = 'clvG7Yfsd5krWT2w/ZhbMP8y4zVHUrAcjirCwk+ZM+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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