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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f5950db61942959f19ff3820d8953000c39f3f0164d2401ff52415191d0610' 
  AND token = '3i0awvV8omtIJUgMtwChGZCJCDIiw7Zb+5TOUegKb+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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