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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87d32921a9aade86e14f798db7dff1f3670fc4d7e8c418636e478c7db9ef24b' 
  AND token = 'OkTDjZYPChRlw6xzWd0UOaAcBNE2D9Ejjg5wCgqK8O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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