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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46dabdaf6b332f2f9c3b7cb636bb884520efa8d3313c3a1a027c88f007faf74f' 
  AND token = '36V574SuXA2sXVfjkvrtGSIH+/L0ROh5r4zTLygo7QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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