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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2661f621232d50e2cbcd96a21e726e8f3343a4b7eefd7466e5753111bccf5b0' 
  AND token = 'RBmmEfgi/dhxr0Kzl36sVydqLo1JfmNuA2X5XHw+ii0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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