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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c352cef87c37579074d98e650f13ca7ab52715d363655adc1acbd01c49cd03a3' 
  AND token = 'KdtuW4v2MXPy2iqkYf2ABlZGH4ttA1Ihh2HxHntwgd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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