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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5864ebae4b4f2717f53b6103bc3acddbf1a532a0c852e78f85ff21b1437f96b8' 
  AND token = 'gOvHkAcUA1l1E0Vk9BuLBNF7ABYaQIMUZ9c1g/xfwKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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