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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b618be8a43cf8fb00667f7ecbf7f10cb1341dadf4a250518743d6618bf0a82d' 
  AND token = '+P/uFNf2zNzmgQAXE9Ex2sP0Xo+lfFA0f5ivcGxLzWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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