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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc4f61ad21dedcd829a64ffdfcb1da38df9318645aa9cfec5720d72015a5680' 
  AND token = '9UYhVxTn67eCK4buT1DCDiqFz0Gz4QGBoox2/7D1fZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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