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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4037ba6991411e63a8c1701be14c42a731c79a70dc124bad2d00d1048baa4b9a' 
  AND token = 'bvAKpywAGIct1TLIjFHZmdR3wlKZ1QaVlZ6eyu15/00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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