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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899facf0672303b9ec6d5042c295f77daeae875ffeeba74dfb9a482aa7bbec18' 
  AND token = '/7fZ53GV7etS4xwV9RViNgGLH8dtlssSqLPl67ZqRDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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