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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407e74f1de9942173fadcf6a2f1b0ec267e04a9b0a5e1d28c07d302e926e46c9' 
  AND token = '8nrfeMACREsP0i6x0pmlIGTTp2sfKRzZJKuNfnUOd4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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