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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6edb2c31e3c23b89974a41750925daf334dd98e5deb1d115e4762552fdfc68c6' 
  AND token = '2zRRBtwoGb12aOl2tv5m6gyP+ZssCXpyWzofJxCWV2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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