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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949d3a5f2de6c5305a5cf07ccac6532305094deb65f16cec0ee2015e0e9a9251' 
  AND token = 'Vhf327ZtOu1Tnswhz1JU7Nk9HoGmv98qCdT0SrkDxf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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