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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13496ebdf4c095c11ccaa40c985835715856564d16b2c024c4eb9cbd8519ecf8' 
  AND token = 'Q6uqsok+HbY5HCy6jjThXu2qEmF1fbbNL9/aG6zNLWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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