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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3fcb4d242ee69223378b78eadb26cbbbcb860152332d0b92c9545d4135616a' 
  AND token = 'zQQ1v/yusNeQKVuDlI7J+o0fzX8lE6reR/nIujImmsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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