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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd81400e5aeb1d28b15fefa34b1124a49e047f8ee1d8e3b87a2a07d3a78eda5' 
  AND token = 'xIk/w5b0O3xiwzHa9ZuufXGEysp91V/pP/6ufF6vdiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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