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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a6c834617f252f4d4d4f1cca3864d53ff03904e1c09b55c9b531d94283c26e' 
  AND token = '2XsJfIvQYHn2Sm8lbumxQGIccPCbC1Wm9DzH3hRFI04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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