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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d64829b9e8057467740f5cef54aaa9db242d9fc9ba45f339c500ac19e927239' 
  AND token = '3P8xF7O8ssZfD4EF8V+0yhJArwJtKdAFG/0lPz/fmrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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