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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2bf05f7743ac72bded2b2cda95612454ed50d229e948bb3d34197218a3e52f' 
  AND token = 'n0CK5L3PnhB6/0kw+YvPQo1d+STmX3O0IY1cuh/qsaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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