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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0d6853d41b73595be4aee255fa0d98d159be1f3a04b0821ec13c36f3ff180f' 
  AND token = 'IMJtKC1W9mFJH72UVH2wKPvo5q/Hx+fiiU6x4KeOC04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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