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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725d3bae685c5755ac16437a8c08e2077613acfdc10238969a4205a5baffec16' 
  AND token = '3Fw8S08gf3xtVmy9WSVgelZ4tSIO9RgnAG7tLsdw5lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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