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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00fe2d2f0304b87952943e4fe1c3704141e63f4e67b6fa77e0d54df1bf9c844f' 
  AND token = 'CPSeRkIjri6h3ZrB2jHFg4sWJjflh/uKHa8RNj7gfTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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