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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d0743233cfd9d6d34429e15196be469f18b332ac1221278bebb2db1702c0e7' 
  AND token = 'ucOPzgiWIJm6770g1wtyr2W5GGyGwztLUugEOlE16kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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