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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5fa3bcd9b99c48cc177e57f0ba09cbdb0bf884f7cab4d79c2b69e6a990e1933' 
  AND token = 'G84jbHnoEAVDCGE0pQk+q1QYm9RYSaG/MRobaAsYolo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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