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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '433232ac99681bd9cf5b6e370c9d75e2205f897574c995dd0e14aa401f195f1e' 
  AND token = '8ftIczQFzNqHB6r7lEsnscrp8cHrj7W5L4SJpYPmz6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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