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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4938c3fc50723aa3bfa5c57cd5dc619d2b220faa92b5754891f7f8f54d3210f' 
  AND token = 'Q+bNEnRucrPS0d2X/BG/zksa8MAe4lwTMFMIA/CzB44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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