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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584a0f4fc9ee9751d801e578e8b27eab47828199f0c1422b7952f583810c8d93' 
  AND token = 'e4QP0nHfj6rXhbgKezUoOKkrw7ZQgivW90fa7vGFV/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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