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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6483556c1866df34fa3f7ef83b571f095fd4ce3a981d01fb0c7b655114dd5740' 
  AND token = 'yWcTvosz/1lzq6F9ovCCw3vDuFO5SSH6WRCUxh8Gr20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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