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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5e10cb29311e5d8f1c6c09157affdea40665973ff569c16fa1c5c460a63dc8' 
  AND token = 'jL3NsMxrCbLxbJkFkjM1Al2e/74o0IkPp/atvPvBu0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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