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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8935b0808675651c79d7e45b3be7acf892f41377acef5d81a07f88b56b2191b0' 
  AND token = 'crTaHApXBIA9Ih2sE4bwRxaGivscuKsVe2a3yUM1wuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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