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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd71cada2a410df5ca846558c9492f711261c99205c3c731ccc2352b95a40bf' 
  AND token = 'bJm7iTo0ejr+WvWt9SA5r0cySYOoMHYahNFcQKUrVwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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