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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96654a51f43ba5f5b7f5e15901e1645f297ca1a7af8701d5b213fc412e75980' 
  AND token = 'eX8nrSMNuUihFy9Pc/+hm4R+W7htM2nMbACUF+47WKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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