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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995cbb5d2507b49ce767aea22f8541cb282788ea673876257bee2654f64fdfbd' 
  AND token = 'PkQ64Dxr/iKgCCy5ZelH1RYMw+sEER2/pmt9tOPQBaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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