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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afb76054578aa7119aa7a60ddf10c20156b6c37ebd35b9bc54d777b2155ae691' 
  AND token = 'ejuXBVaLQ7cJIRgIgJ8E/MgfT2sYitwPb+WMnKVEeQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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