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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde5a56063fbc4453313d26e7d9e8d409cca8d70b235ab20a507dd3568d44307' 
  AND token = 'rvlNyY6bxqf0fziLKjYTWXuWlYBeqsbySP0S+m0aQWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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