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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22b3fee9e614470d72b76821902a8fad6569f79066ee827754650faa137c5e3a' 
  AND token = 'sXofwPTw4LPXdWe8QqmCnbtM+Ha5HNaugLBiKBVIYvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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