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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fded0819c804b681eb7dee32c923cdc3446e7fac9312c32440ff4864fed17417' 
  AND token = 'Oaa76ijYHwaPJ4dqka3g8KJRWmf5mdJ0R3voXxmyDtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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