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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee5c2808761b92ddf558db67152d6c7862bdac29f2062f84936194ce0d0b572' 
  AND token = 'yTjcpEPdjmUyUX1mUgpk8BGcbnvQGv7Xi3DqN24zXrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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