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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2394201d86ccddb12df875a7792f23463e4d1dfcc1441484e0111649b582b2df' 
  AND token = 'axtIJC1oltPdvtyrRlvL+132c2bbzOE9vWhb5IHoK8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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